Operating cost for lights and coffee machines

AI Thread Summary
The discussion revolves around calculating the total operating cost for lights and coffee machines in a business over one year, using a rate of 6.4₵/kWh. Participants clarify the formula for cost, emphasizing the need to calculate the energy consumption of fifteen 100 W light bulbs and two 15 W coffee makers. A mistake in the initial post regarding the power rating of the coffee makers is corrected, confirming they are indeed 15 W. The conversation highlights the importance of accurately interpreting the assignment details to ensure correct calculations. Overall, the focus is on achieving an accurate total cost based on the specified energy usage.
Meeeessttteeehh
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Had a bit of a hard time with this one. Anyone mind giving it a look over?

1. Homework Statement
Find the total cost for a business that operates the following for one year. Assume that the rate is 6.4₵/kWh.
· Fifteen 100 W light bulbs for an average of eight hours a day.
· Two 15 W coffee makers connected to a 120 V power supply for two hours a day each

Homework Equations


cost = E x rate
E = pt

The Attempt at a Solution


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The total cost was asked.
Find the total cost for a business that operates the following for one year.
 
ehild said:
The total cost was asked.

Ohhhh, so the cost of the lights plus the cost of the coffee. Got it! Everything else seem right?
 
Meeeessttteeehh said:
Ohhhh, so the cost of the lights plus the cost of the coffee. Got it! Everything else seem right?
No, I just noticed, that it was 15 W coffee makers instead of 15 ohm.
 
ehild said:
No, I just noticed, that it was 15 W coffee makers instead of 15 ohm.

Oh jeez. Can you tell I'm tired? I just double checked the assignment, it is in fact Ohm's and the watts in the question was an error in my typing. Thanks for catching that!
 
Yes, 15W for a coffee maker looked too little.
 

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